GHSA-mwqm-4fw3-cjvr

Suggest an improvement
Source
https://github.com/advisories/GHSA-mwqm-4fw3-cjvr
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-mwqm-4fw3-cjvr/GHSA-mwqm-4fw3-cjvr.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-mwqm-4fw3-cjvr
Aliases
Published
2026-06-19T19:35:05Z
Modified
2026-09-10T03:51:09Z
Severity
  • 5.1 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N CVSS Calculator
Summary
symfony/ux-autocomplete: XSS via unescaped AJAX response data
Details

Description

The Stimulus controller shipped with symfony/ux-autocomplete renders AJAX response items into the dropdown by interpolating the text field directly into HTML template literals (<div>${item[labelField]}</div>) inside _createAutocompleteWithRemoteData(). The value is parsed as HTML rather than text, so any markup contained in the AJAX response is executed by the browser.

When the dropdown values are derived from user-supplied content, an attacker can craft a string that triggers stored XSS in the browser of any other user who later opens a page containing an autocomplete widget backed by the same data.

Resolution

The option and item renderers used in _createAutocompleteWithRemoteData() now use TomSelect's escape helper to HTML-escape the value by default. Endpoints that legitimately return HTML (for example, to highlight the search term) can opt back in to the previous behavior by setting options_as_html: true. The AutocompleteChoiceTypeExtension normalizer that previously forced options_as_html=false when autocomplete_url was set has been dropped so the opt-in is reachable from the form layer.

The patch for this issue is available here for branch 2.x (and forward-ported to 3.x).

Credits

Symfony would like to thank Alex Ashkov for reporting the issue and Hugo Alliaume for providing the fix.

Database specific 
{
    "cwe_ids":  [
        "CWE-79"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-06-19T19:35:05Z",
    "nvd_published_at":  null,
    "severity":  "MODERATE"
}
References

Affected packages

Packagist / symfony/ux-autocomplete

Package

Name
symfony/ux-autocomplete
Purl
pkg:composer/symfony/ux-autocomplete

Affected ranges

Type
ECOSYSTEM
Events
Introduced
2.2.0
Fixed
2.36.0

Affected versions

v2.*
v2.2.0
v2.3.0
v2.4.0
v2.5.0
v2.6.0
v2.6.1
v2.7.0
v2.7.1
v2.8.0
v2.8.1
v2.9.0
v2.9.1
v2.10.0
v2.11.0
v2.11.1
v2.11.2
v2.12.0
v2.13.0
v2.13.1
v2.13.2
v2.13.3
v2.14.0
v2.14.2
v2.15.0
v2.16.0
v2.17.0
v2.18.0
v2.19.0
v2.19.2
v2.20.0
v2.21.0
v2.22.0
v2.22.1
v2.23.0
v2.24.0
v2.25.0
v2.25.1
v2.25.2
v2.26.0
v2.26.1
v2.27.0
v2.28.0
v2.28.1
v2.28.2
v2.29.0
v2.29.1
v2.29.2
v2.30.0
v2.31.0
v2.32.0
v2.33.0
v2.34.0
v2.35.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-mwqm-4fw3-cjvr/GHSA-mwqm-4fw3-cjvr.json"

Packagist / symfony/ux-autocomplete

Package

Name
symfony/ux-autocomplete
Purl
pkg:composer/symfony/ux-autocomplete

Affected ranges

Type
ECOSYSTEM
Events
Introduced
3.0.0
Fixed
3.1.0

Affected versions

v3.*
v3.0.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-mwqm-4fw3-cjvr/GHSA-mwqm-4fw3-cjvr.json"